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// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Socket control messages
package syscall
import (
// UnixCredentials encodes credentials into a socket control message
// for sending to another process. This can be used for
// authentication.
func UnixCredentials(ucred *Ucred) []byte {
buf := make([]byte, CmsgSpace(SizeofUcred))
cmsg := (*Cmsghdr)(unsafe.Pointer(&buf[0]))
cmsg.Level = SOL_SOCKET
*((*Ucred)(cmsgData(cmsg))) = *ucred
return buf
// ParseUnixCredentials decodes a socket control message that contains
// credentials in a Ucred structure. To receive such a message, the
// SO_PASSCRED option must be enabled on the socket.
func ParseUnixCredentials(msg *SocketControlMessage) (*Ucred, int) {
if msg.Header.Level != SOL_SOCKET {
return nil, EINVAL
if msg.Header.Type != SCM_CREDENTIALS {
return nil, EINVAL
ucred := *(*Ucred)(unsafe.Pointer(&msg.Data[0]))
return &ucred, 0